;(function() {
	/**
	 * 定义需要的方法：Helper-function
	 * 
	 */
	function merge(obj) {	//将{}后面的对象增添到{}中
    	var target, key;
  		for (var i = 1; i < arguments.length; i++) {
  			target = arguments[i];
  			for (key in target) {
	  			if (Object.prototype.hasOwnProperty.call(target, key)) {
	  				obj[key] = target[key];
	  			}
	  		}
		}
	  return obj;
	}
	function replace(regex, opt) {
		regex = regex.source;
		opt = opt || '';
		return function self(name, val) {
			if (!name) return new RegExp(regex, opt);
			val = val.source || val;
			val = val.replace(/(^|[^\[])\^/g, '$1');
			regex = regex.replace(name, val);
			return self;
		};
	}
	function escape(html, encode) {
		return html
		.replace(!encode ? /&(?!#?\w+;)/g : /&/g, '&amp;')
		.replace(/</g, '&lt;')
		.replace(/>/g, '&gt;')
		.replace(/"/g, '&quot;')
		.replace(/'/g, '&#39;');
	}
	function unescape(html) {
		return html.replace(/&([#\w]+);/g, function(_, n) {
			n = n.toLowerCase();
			if (n === 'colon') return ':';
			if (n.charAt(0) === '#') {
				return n.charAt(1) === 'x'
				? String.fromCharCode(parseInt(n.substring(2), 16))
				: String.fromCharCode(+n.substring(1));
			}
			return '';
		});
	}
	function noop() {}
	noop.exec = noop;
    /**
     * 定义规则集，按照此规则将string转换成array
     */
	var block = {
		newline: /^\n+/,	//匹配字符串最开始是\n的所有\n
		code: /^( {4}[^\n]+\n*)+/,		//匹配所有行    开始的字符
		fences: noop,
		hr: /^( *[-*_]){3,} *(?:\n+|$)/,
		heading: /^ *(#{1,6}) *([^\n]+?) *#* *(?:\n+|$)/,
		nptable: noop,
		lheading: /^([^\n]+)\n *(=|-){2,} *(?:\n+|$)/,
		blockquote: /^( *>[^\n]+(\n(?!def)[^\n]+)*\n*)+/,
		list: /^( *)(bull) [\s\S]+?(?:hr|def|\n{2,}(?! )(?!\1bull )\n*|\s*$)/,
		html: /^ *(?:comment *(?:\n|\s*$)|closed *(?:\n{2,}|\s*$)|closing *(?:\n{2,}|\s*$))/,
		def: /^ *\[([^\]]+)\]: *<?([^\s>]+)>?(?: +["(]([^\n]+)[")])? *(?:\n+|$)/,
		table: noop,
		paragraph: /^((?:[^\n]+\n?(?!hr|heading|lheading|blockquote|tag|def))+)\n*/,
		text: /^[^\n]+/
	};
	block.bullet = /(?:[*+-]|\d+\.)/;
	block.item = /^( *)(bull) [^\n]*(?:\n(?!\1bull )[^\n]*)*/;
	block.item = replace(block.item, 'gm')
	(/bull/g, block.bullet)
	();
	block.list = replace(block.list)
	(/bull/g, block.bullet)
	('hr', '\\n+(?=\\1?(?:[-*_] *){3,}(?:\\n+|$))')
	('def', '\\n+(?=' + block.def.source + ')')
	();
	block.blockquote = replace(block.blockquote)
	('def', block.def)
	();
	block._tag = '(?!(?:'
		+ 'a|em|strong|small|s|cite|q|dfn|abbr|data|time|code'
		+ '|var|samp|kbd|sub|sup|i|b|u|mark|ruby|rt|rp|bdi|bdo'
		+ '|span|br|wbr|ins|del|img)\\b)\\w+(?!:/|[^\\w\\s@]*@)\\b';
	block.html = replace(block.html)
	('comment', /<!--[\s\S]*?-->/)
	('closed', /<(tag)[\s\S]+?<\/\1>/)
	('closing', /<tag(?:"[^"]*"|'[^']*'|[^'">])*?>/)
	(/tag/g, block._tag)
	();
	block.paragraph = replace(block.paragraph)
	('hr', block.hr)
	('heading', block.heading)
	('lheading', block.lheading)
	('blockquote', block.blockquote)
	('tag', '<' + block._tag)
	('def', block.def)
	();
	block.normal = merge({}, block);
	block.gfm = merge({}, block.normal, {
		fences: /^ *(`{3,}|~{3,})[ \.]*(\S+)? *\n([\s\S]+?)\s*\1 *(?:\n+|$)/,
		paragraph: /^/,
		heading: /^ *(#{1,6}) +([^\n]+?) *#* *(?:\n+|$)/
	});
	block.gfm.paragraph = replace(block.paragraph)
	('(?!', '(?!'
		+ block.gfm.fences.source.replace('\\1', '\\2') + '|'
		+ block.list.source.replace('\\1', '\\3') + '|')
	();
	block.tables = merge({}, block.gfm, {
		nptable: /^ *(\S.*\|.*)\n *([-:]+ *\|[-| :]*)\n((?:.*\|.*(?:\n|$))*)\n*/,
		table: /^ *\|(.+)\n *\|( *[-:]+[-| :]*)\n((?: *\|.*(?:\n|$))*)\n*/
	});

	var inline = {
		escape: /^\\([\\`*{}\[\]()#+\-.!_>])/,
		autolink: /^<([^ >]+(@|:\/)[^ >]+)>/,
		url: noop,
		tag: /^<!--[\s\S]*?-->|^<\/?\w+(?:"[^"]*"|'[^']*'|[^'">])*?>/,
		link: /^!?\[(inside)\]\(href\)/,
		reflink: /^!?\[(inside)\]\s*\[([^\]]*)\]/,
		nolink: /^!?\[((?:\[[^\]]*\]|[^\[\]])*)\]/,
		strong: /^__([\s\S]+?)__(?!_)|^\*\*([\s\S]+?)\*\*(?!\*)/,
		em: /^\b_((?:__|[\s\S])+?)_\b|^\*((?:\*\*|[\s\S])+?)\*(?!\*)/,
		code: /^(`+)\s*([\s\S]*?[^`])\s*\1(?!`)/,
		br: /^ {2,}\n(?!\s*$)/,
		del: noop,
		text: /^[\s\S]+?(?=[\\<!\[_*`]| {2,}\n|$)/
	};
	inline._inside = /(?:\[[^\]]*\]|[^\[\]]|\](?=[^\[]*\]))*/;
	inline._href = /\s*<?([\s\S]*?)>?(?:\s+['"]([\s\S]*?)['"])?\s*/;
	inline.link = replace(inline.link)
	('inside', inline._inside)
	('href', inline._href)
	();
	inline.reflink = replace(inline.reflink)
	('inside', inline._inside)
	();
	inline.normal = merge({}, inline);
	inline.pedantic = merge({}, inline.normal, {
		strong: /^__(?=\S)([\s\S]*?\S)__(?!_)|^\*\*(?=\S)([\s\S]*?\S)\*\*(?!\*)/,
		em: /^_(?=\S)([\s\S]*?\S)_(?!_)|^\*(?=\S)([\s\S]*?\S)\*(?!\*)/
	});
	inline.gfm = merge({}, inline.normal, {
		escape: replace(inline.escape)('])', '~|])')(),
		url: /^(https?:\/\/[^\s<]+[^<.,:;"')\]\s])/,
		del: /^~~(?=\S)([\s\S]*?\S)~~/,
		text: replace(inline.text)
		(']|', '~]|')
		('|', '|https?://|')
		()
	});
	inline.breaks = merge({}, inline.gfm, {
		br: replace(inline.br)('{2,}', '*')(),
		text: replace(inline.gfm.text)('{2,}', '*')()
	});
	/**
	 * 操作规则集，将string转换成array
	 */
	function Lexer(opt) {
		this.tokens = [];
		this.tokens.links = {};
		this.options = opt || markwo.defaults;
		this.rules = block.normal;
		if (this.options.gfm) {
			if (this.options.tables) {
				this.rules = block.tables;
			} else {
				this.rules = block.gfm;
			}
		}
	}
	Lexer.lex = function(src, opt) {   
		var lexer = new Lexer(opt);    
		return lexer.lex(src);     
	};
	Lexer.prototype.lex=function(src){	
		//先进行简单初次处理
		src = src.replace(/\r\n|\r/g, '\n').replace(/\t/g, '    ').replace(/\u00a0/g, ' ').replace(/\u2424/g, '\n');
		return this.token(src, true);
	}
	Lexer.prototype.token = function(src, top, bq) {
		var src = src.replace(/^ +$/gm, ''), next, loose, cap, bull, b, item, space, i, l;
		while (src) {
			//if (cap = this.rules.newline.exec(src)) {	//	/^\n+/
			//	src = src.substring(cap[0].length);
			//	if (cap[0].length > 1) {
			//		this.tokens.push({
			//			type: 'space'
			//		});
			//	}
			//}
		    // code
		    if (cap = this.rules.code.exec(src)) {		//	/^( {4}[^\n]+\n*)+/
		    	src = src.substring(cap[0].length);
		    	cap = cap[0].replace(/^ {4}/gm, '');
		    	this.tokens.push({
		    		type: 'code',
		    		text: !this.options.pedantic?cap.replace(/\n+$/, ''):cap
		    	});
		    	continue;
		    }

		    // fences (gfm)
		    if (cap = this.rules.fences.exec(src)) {	//  /^ *(`{3,}|~{3,})[ \.]*(\S+)? *\n([\s\S]+?)\s*\1 *(?:\n+|$)/
		    	src = src.substring(cap[0].length);
		    	this.tokens.push({
		    		type: 'code',
		    		lang: cap[2],
		    		text: cap[3]
		    	});
		    	continue;
		    }

		    // heading
		    if (cap = this.rules.heading.exec(src)) {
		    	src = src.substring(cap[0].length);
		    	this.tokens.push({
		    		type: 'heading',
		    		depth: cap[1].length,
		    		text: cap[2]
		    	});
		    	continue;
		    }

		    // table no leading pipe (gfm)
		    if (top && (cap = this.rules.nptable.exec(src))) {
		    	src = src.substring(cap[0].length);

		    	item = {
		    		type: 'table',
		    		header: cap[1].replace(/^ *| *\| *$/g, '').split(/ *\| */),
		    		align: cap[2].replace(/^ *|\| *$/g, '').split(/ *\| */),
		    		cells: cap[3].replace(/\n$/, '').split('\n')
		    	};

		    	for (i = 0; i < item.align.length; i++) {
		    		if (/^ *-+: *$/.test(item.align[i])) {
		    			item.align[i] = 'right';
		    		} else if (/^ *:-+: *$/.test(item.align[i])) {
		    			item.align[i] = 'center';
		    		} else if (/^ *:-+ *$/.test(item.align[i])) {
		    			item.align[i] = 'left';
		    		} else {
		    			item.align[i] = null;
		    		}
		    	}

		    	for (i = 0; i < item.cells.length; i++) {
		    		item.cells[i] = item.cells[i].split(/ *\| */);
		    	}

		    	this.tokens.push(item);

		    	continue;
		    }

		    // lheading
		    if (cap = this.rules.lheading.exec(src)) {
		    	src = src.substring(cap[0].length);
		    	this.tokens.push({
		    		type: 'heading',
		    		depth: cap[2] === '=' ? 1 : 2,
		    		text: cap[1]
		    	});
		    	continue;
		    }

		    // hr
		    if (cap = this.rules.hr.exec(src)) {
		    	src = src.substring(cap[0].length);
		    	this.tokens.push({
		    		type: 'hr'
		    	});
		    	continue;
		    }

		    // blockquote
		    if (cap = this.rules.blockquote.exec(src)) {
		    	src = src.substring(cap[0].length);

		    	this.tokens.push({
		    		type: 'blockquote_start'
		    	});

		    	cap = cap[0].replace(/^ *> ?/gm, '');

		      // Pass `top` to keep the current
		      // "toplevel" state. This is exactly
		      // how markdown.pl works.
		      this.token(cap, top, true);

		      this.tokens.push({
		      	type: 'blockquote_end'
		      });

		      continue;
			}

		    // list
		    if (cap = this.rules.list.exec(src)) {
		    	src = src.substring(cap[0].length);
		    	bull = cap[2];

		    	this.tokens.push({
		    		type: 'list_start',
		    		ordered: bull.length > 1
		    	});

			    // Get each top-level item.
			    cap = cap[0].match(this.rules.item);

			    next = false;
			    l = cap.length;
			    i = 0;

			    for (; i < l; i++) {
			    	item = cap[i];

			        // Remove the list item's bullet
			        // so it is seen as the next token.
			        space = item.length;
			        item = item.replace(/^ *([*+-]|\d+\.) +/, '');

			        // Outdent whatever the
			        // list item contains. Hacky.
			        if (~item.indexOf('\n ')) {
			        	space -= item.length;
			        	item = !this.options.pedantic
			        	? item.replace(new RegExp('^ {1,' + space + '}', 'gm'), '')
			        	: item.replace(/^ {1,4}/gm, '');
			        }

			        // Determine whether the next list item belongs here.
			        // Backpedal if it does not belong in this list.
			        if (this.options.smartLists && i !== l - 1) {
			        	b = block.bullet.exec(cap[i + 1])[0];
			        	if (bull !== b && !(bull.length > 1 && b.length > 1)) {
			        		src = cap.slice(i + 1).join('\n') + src;
			        		i = l - 1;
			        	}
			        }

			        // Determine whether item is loose or not.
			        // Use: /(^|\n)(?! )[^\n]+\n\n(?!\s*$)/
			        // for discount behavior.
			        loose = next || /\n\n(?!\s*$)/.test(item);
			        if (i !== l - 1) {
			        	next = item.charAt(item.length - 1) === '\n';
			        	if (!loose) loose = next;
			        }

			        this.tokens.push({
			        	type: loose
			        	? 'loose_item_start'
			        	: 'list_item_start'
			        });

			        // Recurse.
			        this.token(item, false, bq);

			        this.tokens.push({
			        	type: 'list_item_end'
			        });
		    	}

			    this.tokens.push({
			    	type: 'list_end'
			    });

			    continue;
			}
		    if (cap = this.rules.html.exec(src)) {  // /^ *(?:comment *(?:\n|\s*$)|closed *(?:\n{2,}|\s*$)|closing *(?:\n{2,}|\s*$))/
		    	src = src.substring(cap[0].length);
		    	this.tokens.push({
		    		type: this.options.sanitize
		    		? 'paragraph'
		    		: 'html',
		    		pre: !this.options.sanitizer
		    		&& (cap[1] === 'pre' || cap[1] === 'script' || cap[1] === 'style'),
		    		text: cap[0]
		    	});
		    	continue;
		    }

		    if ((!bq && top) && (cap = this.rules.def.exec(src))) {
		    	src = src.substring(cap[0].length);
		    	this.tokens.links[cap[1].toLowerCase()] = {
		    		href: cap[2],
		    		title: cap[3]
		    	};
		    	continue;
		    }

		    if (top && (cap = this.rules.table.exec(src))) {
		    	src = src.substring(cap[0].length);

		    	item = {
		    		type: 'table',
		    		header: cap[1].replace(/^ *| *\| *$/g, '').split(/ *\| */),
		    		align: cap[2].replace(/^ *|\| *$/g, '').split(/ *\| */),
		    		cells: cap[3].replace(/(?: *\| *)?\n$/, '').split('\n')
		    	};

		    	for (i = 0; i < item.align.length; i++) {
		    		if (/^ *-+: *$/.test(item.align[i])) {
		    			item.align[i] = 'right';
		    		} else if (/^ *:-+: *$/.test(item.align[i])) {
		    			item.align[i] = 'center';
		    		} else if (/^ *:-+ *$/.test(item.align[i])) {
		    			item.align[i] = 'left';
		    		} else {
		    			item.align[i] = null;
		    		}
		    	}

		    	for (i = 0; i < item.cells.length; i++) {
		    		item.cells[i] = item.cells[i]
		    		.replace(/^ *\| *| *\| *$/g, '')
		    		.split(/ *\| */);
		    	}

		    	this.tokens.push(item);

		    	continue;
		    }

		    // top-level paragraph
		    if (top && (cap = this.rules.paragraph.exec(src))) {
		    	src = src.substring(cap[0].length);
		    	this.tokens.push({
		    		type: 'paragraph',
		    		text: cap[1].charAt(cap[1].length - 1) === '\n'?cap[1].slice(0, -1):cap[1]
		    	});
		    	continue;
		    }

		    // text
		    if (cap = this.rules.text.exec(src)) {
		      // Top-level should never reach here.
		      src = src.substring(cap[0].length);
		      this.tokens.push({
		      	type: 'text',
		      	text: cap[0]
		      });
		      continue;
		  	}

		  	if (src) {
		  		throw new Error('Infinite loop on byte: ' + src.charCodeAt(0));
		  	}
		}
		return this.tokens;
	}
    /**
     * InlineLexer
     */
	function InlineLexer(links, opt) {
		this.options = opt || markwo.defaults;
		this.links = links;
		this.rules = inline.normal;
		this.renderer = this.options.renderer || new Renderer;
		this.renderer.options = this.options;

		if (!this.links) {
			throw new
			Error('Tokens array requires a `links` property.');
		}

		if (this.options.gfm) {
			if (this.options.breaks) {
				this.rules = inline.breaks;
			} else {
				this.rules = inline.gfm;
			}
		} else if (this.options.pedantic) {
			this.rules = inline.pedantic;
		}
	}
	InlineLexer.output = function(src, links, options) {
		var inline = new InlineLexer(links, options);
		return inline.output(src);
	};
	InlineLexer.prototype.output = function(src) {
  		var out = '', link, text, href, cap;
  		while (src) {
		    // escape
		    if (cap = this.rules.escape.exec(src)) {
		    	src = src.substring(cap[0].length);
		    	out += cap[1];
		    	continue;
		    }
		    // autolink
		    if (cap = this.rules.autolink.exec(src)) {
		    	src = src.substring(cap[0].length);
		    	if (cap[2] === '@') {
		    		text = cap[1].charAt(6) === ':'
		    		? this.mangle(cap[1].substring(7))
		    		: this.mangle(cap[1]);
		    		href = this.mangle('mailto:') + text;
		    	} else {
		    		text = escape(cap[1]);
		    		href = text;
		    	}
		    	out += this.renderer.link(href, null, text);
		    	continue;
		    }
		    // url (gfm)
		    if (!this.inLink && (cap = this.rules.url.exec(src))) {
		    	src = src.substring(cap[0].length);
		    	text = escape(cap[1]);
		    	href = text;
		    	out += this.renderer.link(href, null, text);
		    	continue;
		    }
		    // tag
		    if (cap = this.rules.tag.exec(src)) {
		    	if (!this.inLink && /^<a /i.test(cap[0])) {
		    		this.inLink = true;
		    	} else if (this.inLink && /^<\/a>/i.test(cap[0])) {
		    		this.inLink = false;
		    	}
		    	src = src.substring(cap[0].length);
		    	out += this.options.sanitize
		    	? this.options.sanitizer
		    	? this.options.sanitizer(cap[0])
		    	: escape(cap[0])
		    	: cap[0]
		    	continue;
		    }
		    // link
		    if (cap = this.rules.link.exec(src)) {
		    	src = src.substring(cap[0].length);
		    	this.inLink = true;
		    	out += this.outputLink(cap, {
		    		href: cap[2],
		    		title: cap[3]
		    	});
		    	this.inLink = false;
		    	continue;
		    }
		    // reflink, nolink
		    if ((cap = this.rules.reflink.exec(src))|| (cap = this.rules.nolink.exec(src))) {
		    	src = src.substring(cap[0].length);
		    	link = (cap[2] || cap[1]).replace(/\s+/g, ' ');
		    	link = this.links[link.toLowerCase()];
		    	if (!link || !link.href) {
		    		out += cap[0].charAt(0);
		    		src = cap[0].substring(1) + src;
		    		continue;
		    	}
		    	this.inLink = true;
		    	out += this.outputLink(cap, link);
		    	this.inLink = false;
		    	continue;
		    }
		    // strong
		    if (cap = this.rules.strong.exec(src)) {
		    	src = src.substring(cap[0].length);
		    	out += this.renderer.strong(this.output(cap[2] || cap[1]));
		    	continue;
		    }
		    // em
		    if (cap = this.rules.em.exec(src)) {
		    	src = src.substring(cap[0].length);
		    	out += this.renderer.em(this.output(cap[2] || cap[1]));
		    	continue;
		    }
		    // code
		    if (cap = this.rules.code.exec(src)) {
		    	src = src.substring(cap[0].length);
		    	out += this.renderer.codespan(escape(cap[2], true));
		    	continue;
		    }
		    // br
		    if (cap = this.rules.br.exec(src)) {
		    	src = src.substring(cap[0].length);
		    	out += this.renderer.br();
		    	continue;
		    }
		    // del (gfm)
		    if (cap = this.rules.del.exec(src)) {
		    	src = src.substring(cap[0].length);
		    	out += this.renderer.del(this.output(cap[1]));
		    	continue;
		    }
		    // text
		    if (cap = this.rules.text.exec(src)) {
		    	src = src.substring(cap[0].length);
		    	out += this.renderer.text(escape(this.smartypants(cap[0])));
		    	continue;
		    }
		    if (src) {
		    	throw new
		    	Error('Infinite loop on byte: ' + src.charCodeAt(0));
		    }
		}
	  	return out;
	};
	InlineLexer.prototype.outputLink = function(cap, link) {
		var href = escape(link.href)
		, title = link.title ? escape(link.title) : null;

		return cap[0].charAt(0) !== '!'
		? this.renderer.link(href, title, this.output(cap[1]))
		: this.renderer.image(href, title, escape(cap[1]));
	};
	InlineLexer.prototype.smartypants = function(text) {
		if (!this.options.smartypants) return text;
		return text
		    // em-dashes
		    .replace(/---/g, '\u2014')
		    // en-dashes
		    .replace(/--/g, '\u2013')
		    // opening singles
		    .replace(/(^|[-\u2014/(\[{"\s])'/g, '$1\u2018')
		    	// closing singles & apostrophes
		    	.replace(/'/g, '\u2019')
		    	// opening doubles
		    	.replace(/(^|[-\u2014/(\[{\u2018\s])"/g, '$1\u201c')
		    // closing doubles
		    .replace(/"/g, '\u201d')
		    // ellipses
		    .replace(/\.{3}/g, '\u2026');
	};
	InlineLexer.prototype.mangle = function(text) {
		if (!this.options.mangle) return text;
		var out = ''
		, l = text.length
		, i = 0
		, ch;

		for (; i < l; i++) {
			ch = text.charCodeAt(i);
			if (Math.random() > 0.5) {
				ch = 'x' + ch.toString(16);
			}
			out += '&#' + ch + ';';
		}

		return out;
	};
	/**
	 * 渲染操作，按照array的type属性转换数组为目标string
	 */
	function Renderer(opt) {
		this.options = opt || {};
	}
	Renderer.prototype.code = function(code, lang, escaped) {
		if (this.options.highlight) {
			var out = this.options.highlight(code, lang);
			if (out != null && out !== code) {
				escaped = true;
				code = out;
			}
		}

		if (!lang) {
			return '<pre><code>'
			+ (escaped ? code : escape(code, true))
			+ '\n</code></pre>';
		}

		return '<pre><code class="'
		+ this.options.langPrefix
		+ escape(lang, true)
		+ '">'
		+ (escaped ? code : escape(code, true))
		+ '\n</code></pre>\n';
	};
	Renderer.prototype.blockquote = function(quote) {
		return '<blockquote>\n' + quote + '</blockquote>\n';
	};
	Renderer.prototype.html = function(html) {
		return html;
	};
	Renderer.prototype.heading = function(text, level, raw) {
		return '<h'+level+'>'+text+'</h'+level+'>\n';
	};
	Renderer.prototype.hr = function() {
		return this.options.xhtml ? '<hr/>\n' : '<hr>\n';
	};
	Renderer.prototype.list = function(body, ordered) {
		var type = ordered ? 'ol' : 'ul';
		return '<' + type + '>\n' + body + '</' + type + '>\n';
	};
	Renderer.prototype.listitem = function(text) {
		return '<li>' + text + '</li>\n';
	};
	Renderer.prototype.paragraph = function(text) {
		return '<p>' + text + '</p>\n';
	};
	Renderer.prototype.table = function(header, body) {
		return '<div class="table-box"><table>\n'
		+ '<thead>\n'
		+ header
		+ '</thead>\n'
		+ '<tbody>\n'
		+ body
		+ '</tbody>\n'
		+ '</table></div>\n';
	};
	Renderer.prototype.tablerow = function(content) {
		return '<tr>\n' + content + '</tr>\n';
	};
	Renderer.prototype.tablecell = function(content, flags) {
		var type = flags.header ? 'th' : 'td';
		var tag = flags.align
		? '<' + type + ' style="text-align:' + flags.align + '">'
		: '<' + type + '>';
		return tag + content + '</' + type + '>\n';
	};
	// span level renderer
	Renderer.prototype.strong = function(text) {
		return '<strong>' + text + '</strong>';
	};
	Renderer.prototype.em = function(text) {
		return '<em>' + text + '</em>';
	};
	Renderer.prototype.codespan = function(text) {
		return '<code>' + text + '</code>';
	};
	Renderer.prototype.br = function() {
		return this.options.xhtml ? '<br/>' : '<br>';
	};
	Renderer.prototype.del = function(text) {
		return '<del>' + text + '</del>';
	};
	Renderer.prototype.link = function(href, title, text) {
		if (this.options.sanitize) {
			try {
				var prot = decodeURIComponent(unescape(href))
				.replace(/[^\w:]/g, '')
				.toLowerCase();
			} catch (e) {
				return '';
			}
			if (prot.indexOf('javascript:') === 0 || prot.indexOf('vbscript:') === 0) {
				return '';
			}
		}
		var out = '<a href="' + href + '"';
		if (title) {
			out += ' title="' + title + '"';
		}
		out += '>' + text + '</a>';
		return out;
	};
	Renderer.prototype.image = function(href, title, text) {
		var out = '<img src="' + href + '" alt="' + text + '"';
		if (title) {
			out += ' title="' + title + '"';
		}
		out += this.options.xhtml ? '/>' : '>';
		return out;
	};
	Renderer.prototype.text = function(text) {
		return text;
	};
	/**
	 * 控制器，控制渲染流程
	 */
	function Parser(opt) {
		this.tokens = [];
		this.token = null;
		this.options = opt || markwo.defaults;
		this.options.renderer = this.options.renderer || new Renderer;
		this.renderer = this.options.renderer;
		this.renderer.options = this.options;
	}
	Parser.parse = function(src, opt, renderer) {   
		var parser = new Parser(opt, renderer);       
		return parser.parse(src);                         
	};
	Parser.prototype.parse = function(src) {
		this.inline = new InlineLexer(src.links, this.options, this.renderer);
		this.tokens = src.reverse();	//将数组反转过来：link:Object,Object,Object,Object...第一个Object
		var out = '';
		while (this.next()) {
			out += this.tok();
		}
		return out;
	};
	Parser.prototype.next = function() {
  		return this.token = this.tokens.pop();  //删除并返回数组的最后一个元素。
	};
	Parser.prototype.tok = function() {
		switch (this.token.type) {
			case 'space': {
				return '';
			}
			case 'hr': {
				return this.renderer.hr();
			}
			case 'heading': {
				return this.renderer.heading(
					this.inline.output(this.token.text),
					this.token.depth,
					this.token.text);
			}
			case 'code': {
				return this.renderer.code(this.token.text,
					this.token.lang,
					this.token.escaped);
			}
			case 'table': {
				var header = ''
				, body = ''
				, i
				, row
				, cell
				, flags
				, j;
      			// header
      			cell = '';
      			for (i = 0; i < this.token.header.length; i++) {
      				flags = { header: true, align: this.token.align[i] };
      				cell += this.renderer.tablecell(
      					this.inline.output(this.token.header[i]),
      					{ header: true, align: this.token.align[i] }
      					);
      			}
      			header += this.renderer.tablerow(cell);

      			for (i = 0; i < this.token.cells.length; i++) {
      				row = this.token.cells[i];

      				cell = '';
      				for (j = 0; j < row.length; j++) {
      					cell += this.renderer.tablecell(
      						this.inline.output(row[j]),
      						{ header: false, align: this.token.align[j] }
      						);
      				}

      				body += this.renderer.tablerow(cell);
      			}
      			return this.renderer.table(header, body);
 			}
 			case 'blockquote_start': {
 				var body = '';

 				while (this.next().type !== 'blockquote_end') {
 					body += this.tok();
 				}

 				return this.renderer.blockquote(body);
 			}
 			case 'list_start': {
 				var body = ''
 				, ordered = this.token.ordered;

 				while (this.next().type !== 'list_end') {
 					body += this.tok();
 				}

 				return this.renderer.list(body, ordered);
 			}
 			case 'list_item_start': {
 				var body = '';

 				while (this.next().type !== 'list_item_end') {
 					body += this.token.type === 'text'
 					? this.parseText()
 					: this.tok();
 				}

 				return this.renderer.listitem(body);
 			}
 			case 'loose_item_start': {
 				var body = '';

 				while (this.next().type !== 'list_item_end') {
 					body += this.tok();
 				}

 				return this.renderer.listitem(body);
 			}
 			case 'html': {
 				var html = !this.token.pre && !this.options.pedantic
 				? this.inline.output(this.token.text)
 				: this.token.text;
 				return this.renderer.html(html);
 			}
 			case 'paragraph': {
 				return this.renderer.paragraph(this.inline.output(this.token.text));
 			}
 			case 'text': {
 				return this.renderer.paragraph(this.parseText());
 			}
 		}
	};
	/**
	 * 需要暴露的接口，及默认参数
	 */
    function markwo(src,opt){
    	try{
    		if (opt)opt = merge({}, markwo.defaults, opt);
    		return Parser.parse(Lexer.lex(src,opt));
    	}catch(e){
    		console.log('error');
    	}
    }
    markwo.defaults = {
    	pedantic: false,	//完全遵守markdown原始规范，不作任何改变，选择false
    	gfm: true,			//遵照github markdown 规范，选择true
    	sanitize: false,		//过滤任何输入的HTML语句，保证安全，选择true
    	tables: true,		//开启github markdown中的table支持
    	breaks: true,		//开启github markdown中的line支持
    	sanitizer: null,
    	mangle: true,
    	smartLists: false,	//开启更美观的的list风格代替原始的markdown标准
    	silent: false,
    	highlight: null,	//对强调语句的特殊支持函数
    	langPrefix: 'lang-',//
    	smartypants: false,
    	//headerPrefix: '',	//设置代码的class前缀
    	renderer: new Renderer,
    	xhtml: false
    };
    this.markwo = markwo;
}).call(function() {
    return this || (typeof window !== 'undefined' ? window : global);	//第一步执行
}());